Application Support

Introducing Ceramic Capacitors for Use in Factory Automation (FA)

Factory Automation
In the area of factory automation (FA*1), the smart factory trend has led to a heightened need for smaller devices, improved reliability and higher heat resistance. While in the area of ceramic capacitors, the commercialization of products that are compatible with a wider capacitance range and that support higher withstanding voltage specifications is being promoted. 
Here, we introduce examples of circuits, for power supplies and inverters that are actually used in FA applications. 

 

*1 FA:Factory Automation








Murata Icon X Factory Automation Block Diagram

Factory Automation

Fig.1 Factory Automation Block Diagram


The above figure shows a general block diagram illustrating factory automation.
FA is made up of PLCs, inverter drivers, AC servomotors, various power supplies, and other devices.

This page provides circuit examples for AC/DC and DC/DC converters, examples of inverter circuits, and examples of power supplies for circuit breakers.

Murata Icon X Example of Applied Circuit (AC/DC converter, DC/DC converter)

Factory Automation

Fig.2 AC/DC DC/DC Converter Block Diagram


The above is an example of a general circuit for an AC/DC converter and a DC/DC converter.


(1) Safety Certified capacitors are required for AC line filters (C1, C2) and coupling capacitors (C3) in primary and secondary coupling.

Our new products rated at AC 400 V and AC 500 V are suitable for AC 400-V and AC 690-V AC/DC converters.

Type Safety standard subclass
Rated voltage

SMD X1/X2/Y2
AC250V
GA3 Series, Safety Standard Certified Chip Multilayer Ceramic Capacitors for General Purpose 
Lead X1/Y1
AC500V
DE1 Series General use Safety standard certified (X1, Y1) Lead-type ceramic capacitor Type RA
X1/Y1 AC500V
(X1 760V)
DE1 Series General use Safety standard certified (X1, Y1) Lead-type ceramic capacitor Type RB
X1/Y2
AC400V
DE2 Series General use Safety standard certified (X1, Y2) Lead-type ceramic capacitor Type SA

(2) Low-loss capacitors are required for snubber capacitors (C5, C6), since high-frequency switching is applied. 

Accordingly, temperature compensation-type (Class 1) capacitors are recommended.  
On the other hand, for C7, high capacity is required since high frequency noise components must be removed. For this, high dielectric constant (Class 2) capacitors are recommended.

Factory Automation

Fig.3 Example of DC Bias by Temperature Characteristics

Type
SMD
GRM Series, Chip Multilayer Ceramic Capacitors for General Purpose 
GR3 Series, High Effective Capacitance & High Ripple Current Chip Multilayer Ceramic Capacitors for General Purpose
Lead RDE Series, Lead Type Multilayer Ceramic Capacitors for General Purpose 

(3) Relatively large-capacity capacitors are required for smoothing capacitors (C4, C8) to remove low-frequency noise.

Type
SMD
KRM Series, Metal Terminal Type Multilayer Ceramic Capacitors for General Purpose
KR3 Series, High Effective Capacitance & High Ripple Current Metal Terminal Type Multilayer Ceramic Capacitors for General Purpose
Lead RDE Series, Lead Type Multilayer Ceramic Capacitors for General Purpose

Murata Icon X Example of Applied Circuit (inverter circuit)

Murata Icon X Circuit example (power supply for circuit breaker)

Fig. 5 Power supply for circuit breaker

The above example shows a power supply used in a circuit breaker.

(1) Smoothing capacitors (C1) must be relatively large capacitors to eliminate low frequency noise.

Type
SMD
GR3 Series General use chip multilayer ceramic capacitor with highly effective capacitance and high ripple-current resistance
KR3 Series, High Effective Capacitance & High Ripple Current Metal Terminal Type Multilayer Ceramic Capacitors for General Purpose
Lead RDE Series, Lead Type Multilayer Ceramic Capacitors for General Purpose

(2) Primary and secondary coupling capacitors (C2) must be capacitors that have obtained safety standard certification.
AC 500-V and AC 400-V rated products are suitable for supplying power to breakers through high impulse resistance.

Type Safety standard subclass
Rated voltage

Lead X1/Y1
AC500V DE1 Series General use Safety standard certified (X1, Y1) Lead-type ceramic capacitor Type RA
X1/Y1
AC500V
(X1 760V)
DE1 Series General use Safety standard certified (X1, Y1) Lead-type ceramic capacitor Type RB
X1/Y2
AC400V DE2 Series General use Safety standard certified (X1, Y2) Lead-type ceramic capacitor Type SA